# frequency of the CPU (in Hz)
F_CPU = 16000000UL
TARGET = main
CC = avr-gcc


all: hex flash

hex: $(TARGET).hex

# avr-gcc : compiler for AVR microcontrollers, https://gcc.gnu.org/wiki/avr-gcc#Using_avr-gcc, https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html
#	-mmcu : the target microcontrolle (ATmega328P)
#	-D : defines a preprocessor macro (#define F_CPU <value>)
#	-o : output filename
$(TARGET).bin: $(TARGET).c
	$(CC) -mmcu=atmega328p -D F_CPU=$(F_CPU) $(TARGET).c -o $(TARGET).bin


# avr-objcopy : man avr-jobcopy, https://linux.die.net/man/1/avr-objcopy
#	-O : specifies output format, Intel HEX
#		some formats (list not found in any doc) :
#		-O ihex : Used for flashing AVR chips
#		-O binary : Raw binary file
#		-O elf32-avr : Used for debugging
$(TARGET).hex: $(TARGET).bin
	avr-objcopy -O ihex $(TARGET).bin $(TARGET).hex


# avr-dude : AVR Downloader/UploaDEr, upload firmware, https://avrdudes.github.io/avrdude, v6.3 https://download-mirror.savannah.gnu.org/releases/avrdude/avrdude-doc-6.3.pdf
#	-p : specifies the microcontroller -> m328p
#	-c : programmer-id
#	-b : baud rate for serial communication
#	-P : the serial port, found with `ls /dev/tty*` -> /dev/ttyUSB0
#	-U : Uploads (w = write) the HEX firmware file to the flash memory
#	(-v : verbose info dump)
flash:
	avrdude -p m328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:w:$(TARGET).hex
#	avrdude -p m328p -c arduino -b 115200 -P /dev/ttyUSB0 -v
#	avrdude -p m328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:w:../../ressources/dump_atmega328p_ori.hex


dump:
	avrdude -p m328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:r:dump_atmega328p.hex


clean:
	rm -f main.hex main.bin


.PHONY : all clean hex flash dump